Hi everyone, first of all I would like to apologize for my poor english...
I was wandering if it's possible to power a tda7492p amplifier by battery. if it's possible, which kind of battery should I use in order to keep it working for 10 hours? thanks in advance for any answer

To deliver 50 watts (rms) into an 8 ohm speaker means that you need a DC supply of around 60 volts in total. That can be a single 60 volt supply or a split 30-0-30 dual supply.

You need a voltage that high so that the amplifier can put 20 volts rms (AC voltage) across the speaker. That figure corresponds to 50 watts rms.

To do that with batteries isn't really practical.

There are probably better options available. If your speakers are lower impedance (4 ohm) then you can get more power for a lower voltage.

Other options are Class D amplifiers (probably the best bet for battery use), or you could look at bridged 'chip amplifiers' a little like the TDA7294 but even here you would at least two 12 volt batteries. You would be probably be looking at VRLA types (valve regulated lead acid... like you get in alarm systems)

sorry if I ask you this question, but I'm new in the diy audio field... can you please suggest me an amplifier as powerful and cheap as the tda7492 but can work using a battery? I would have liked to use it with two 4ohm speakers. Another thing... how many amps should the battery be to make it work for 10 hours?
I do apologize again for my poor english

Something like the TDA1558 might appeal to you. It would run off a single 12 volt battery (having multiple batteries to charge is inconvenient and messy). If you look at figure 4 in the data sheet then that shows a bridged amplifier.

The battery capacity would probably be something like a 12 volt 7AH as a minimum capacity for typical music use.

There are many many chip amps available, but I'm afraid I'm not very well up on what is available in that line. It might be worth you asking for recommendations by posting a thread in the 'Chip amps' forum.

I see... but I'm looking for a pre-made amplifier ahahah
I wasn't able to find one based on the tda1558... there is the tda1558Q, but it seems that no one sells it.
Can you suggest me any cheap pre-made amplifier?
sorry if I'm asking you al lot of questions, but i need to build a boombox and I don't have a lot of time to do it ahahah